Portable motor



22mm/O O. R. FRITZ PORTABLE MOTOR Jan.. 28, 194% Filed Oct. 15, 1933 l@ M.. .Nm @um www@ www@ El m mw G w 5 O Patented Jan. 28, 1941 UNITED STATES PATENT OFFICE PORTABLE Moron Application October 15, 1938, Serial No. 235,166 In Germany December 3, 1937 4 Claims.

The invention relates to portable internal combustion engines especially adapted for actuating saws used for cutting trees, etc. When such man chines are to be used in the open all the year round, and being consequently exposed to all weather conditions, the exposed and more delin cate parts of the engine, such as the carburetor, the controls therefor and so forth, are liable to be damaged and deleteriously affected. For this reason some iform of protective covering for these parts is4 highly desirable which whilst being strong, light in weight and compact, should be capable of covering all the most vulnerable parts.

For this reason according to the invention there is provided for a machine of the kind in question a cover which also forms the fuel container for the engine, and is designed and arranged to directly or indirectly cover and accommodate those parts of the machine most requiring protection, and which is adapted to be mounted on the internal combustion engine-hereinafter referred to as a motor-with interposition of heat insulating means.

An embodiment of the invention is illustrated in the accompanying drawing, in which:

Fig. 1 shows a cover in the form of a fuel container in vertical section,

Fig. 2 is a plan view of the fuel container, and

Fig. 3 shows a modification in vertical section.

Referring first to the construction shown in Figs. 1 and 2, I designates the carburetor disposed in a housing inside the fuel container; said housing being covered by a cover 2. The carburetor I is controlled by a twist grip handle r' 3, through the medium of the link 4, disposed inside one of the hollow handle brackets 5, turning the handle 3 causing the throttle to be opened and closed. The carburetor is arranged in a position intermediate of the two levels 'I and 8 representing highest and lowest fuel levels. The fuel is fed by a drilled duct 9 and a flexible tube I0 whichcarries at its free end a weighted member I2 provided with an inlet bore II. The member I2 drops by gravity onto the lowest point with the container in any position,-see positions a and b of the tube I0, so that the feed of the fuel is assured. With this arrangement, if a carburetor of the floatless type is used, it is possible to work the machine turned from normal position through 180. In other words it is possible to use the engine as for sawing recumbent tree trunks, not only from the top downwards, but in the opposite direction where there is space beneath the tree trunk. This is very advantageous in practice 5 because in the case of tree trunks lying with a (Cl. 12S-195) space beneath them, and cutting downwards with a machine having a chain saw guide, the guide and saw always tend to jam in the cut; when however, sawing upwards this does not occur because the weight of the tree causes the cut to 5 open. In order to meet this requirement, the present device is so constructed that it may be be used in upright or reversed position. To this end, the two ducts I3 and Menable atmospheric pressure to exist in the container with the machine in any position, the duct I4 serving as an air inlet to the container with the machine in normal position, and the duct I3 then being full of fuel. When the` machine is turned through 180 the duct I3 empties and serves as an air 15 inlet, and the duct I4 fills with fuel. The two ducts I3 and I4 are arranged in accordance with the axis of rotation of the machine, so that with the container in the midposition between 0 and 180, the two air ducts I3 and I4 are disposed at the highest point of the container, and both being devoid of fuel serve as vents.

The ignition switch I5 and its wire I6, are also disposed in the fuel container or a casing therefor, so that they are also protected against the elements and damage. The connection of the wire I6 to the source of the ignition current is such, that when the fuel container or its casing is mounted on the motor, electrical connection between said switch and source of current o is automatically established. Such an arrangement is shown in Fig. 1. Fixed to a casing I9, which may cover a magneto, is a contact spring I8 to which is connected a wire I1 leading to the source of the ignition current, such as a magneto; coacting with said spring I8 is a contact screw 20 carried by the fuel container, and to said screw 20 is connected the wire IB. When the fuel container is applied to the motor, the contact spring I8 is engaged by the screw 20 40 and tensioned so that a firm contact is provided between the member I8, 20.

Between the inlet aperture I I in the weight I2, and the outlet aperture 2l of the fuel feed ducts 9 and I0, a fuel tap 22 is provided at a suitable 45 position. Suitable means (not shown) are provided for cleaning the air fed to the carburetor I, this air being fed to the latter by the air admission pipe 23 disposed inside the fuel container or its casing. After being purified this air is kept away from the atmosphere, so that only pure air is fed to the carburetor. The mixture from the carburetor is conducted by the passage 24 to the motor.

Fig. 3 shows an arrangement by way of ex- 55 ample, in which the carburetor l is fitted outside the fuel container 25. The carburetor is, however, completely covered by a casing or shell 21 of the container, and is controlled by the linkage 4 in the hollow handle support 5, presented by the casing 21. Access to the carburetor during the assembly of the machine, can be obtained by means of the detachable cover 26.

In both constructions the parts inside or outside the fuel container 25, such as. the carburetor l, carburetor control linkage 4, ignition switch I5 and so forth form in both constructions a unit with the fuel container, and the latter with all these accessory parts can be bolted to the body of the motor and detached therefrom without any dismantling of the parts being necessary, it being merely necessary to screw down or unscrew the screws 28. This method of assembly is advantageous as regards manufacture, and also as regards service. The fuel container can be removed if necessary, and replaced by another one fully equipped with the accessory parts, thus saving time in the case of repairs being necessary.

The fuel container is mounted directly on the body 29 of the engine, and is insulated by the insulation 353, 'Ihe latter may consist of insulating plates 3l and 32, consisting of a material which is a poor heat conductor, and said plates are spaced apart so that a chamber 33 is provided, the air in said chamber also assisting in the heat insulation.

To improve the insulation, the chamber 33 may communicate at one end with a distribution chamber 34 communicating with a fan provided to cool the engine, the other end of said chamber communicating with the atmosphere. Thus a current of cooling air may be forced by the fan into the chamber 33, through which it passes in the direction indicated by the arrow, and passes out at 31. By this means a continual supply of fresh air may be provided for cooling, so that adequate insulation is ensured.

What I claim is:

l. In combination with an internal combustion engine having a carburetor and an ignition switch, a fuel container resting on top of a part of said engine and being shaped and arranged to cover and protect said carburetor and ignition switch.

2. In combination with an internal combustion engine having a carburetor, a fuel container resting on top of a part of said engine and enclosing and supporting said carburetor.

3. The combination, as claimed in claim 2, comprising two hollow brackets formed on said container, linkage for controlling the carburetor throttle disposed at least partly in one of said hollow brackets, and a twist grip handle carried by said brackets and connected with said linkage to open or close the carburetor.

4. The combination with an internal combustion engine comprising a carburetor and an ignition device, of a fuel container mounted on a part of said engine and being shaped and arranged to cover and protect said carburetor and ignition device, of part of said carburetor projecting beyond the walls of said fuel container, a casing secured to said fuel container and enclosing the projecting part of said carburetor.

OSWALD RUDOLF FRITZ. 

